/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.visualization.graphviz;

import org.neo4j.graphdb.Entity;

interface ParameterGetter<C extends Entity>
{
    /**
     * Get the value for a parameter.
     * @param container
     *            the node or relationship to get the value for.
     * @param key
     *            the parameter to get.
     * @return the value of the parameter, or <code>null</code> to not emit
     *         the parameter for this node/relationship.
     */
    String getParameterValue( C container, String key );
}
